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QoS

Quality of Service
 - Used to define the level of service and control the transmission of different types of traffic (voice, data, video).

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QSIG

The protocol for networking telecommunications systems from different manufacturers.

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Quad Fibre Cable

A type of fibre optic cable that has four single cables enclosed in an extruded jacket of polyvinyl chloride (PVC), with a rip cord for pulling back the jacket to access the fibres.